| http://www.w3.org/ns/prov#value | - According to William M. Thurlbeck and Joanne L. Wright, authors of the book Thurlbeck's Chronic Airflow Obstruction, excess mucus can accumulate in your respiratory system when you have a cold, intolerance to a particular food, influenza, allergies or a chronic lung disease such as cystic fibrosis.
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